Upgrade to remove ads
Audiometry Quiz #1
Terms in this set (43)
What are two questions to ask when a patient comes in for a hearing test?
1.) Why do you need a hearing test?
2.) Who referred you?
A case history is essential to determine what 3 things?
1.) Factors that contributed to the referral
2.) Factors that could possibly contribute to the suspected pathology
3.) the test strategy that might be used
What are signs of an abnormal otoscopy first examination of outer ear?
*low set pinnae
*lacerations, bleeding, bruising
*abnormal growths, patches
*signs of previous surgery
What was the first hearing test?
Tuning Fork Test
What kind of tone does the Fork produce?
Soft tune that decays quickly; Hilt produces same frequency so you can use it to stimulate bone conduction
What is the range the Fork produces?
Depending on the length of the tines, each fork produces a
different frequency, ranging from 128 to 8192Hz. The longer the tines, the lower the frequency.
What is the Occlusion Effect?
When the external canal is occluded or if the middle ear is filled with fluid, for example, the sound no longer escapes and the sound appears louder by bone conduction. This has been called an increase in bone conduction sensitivity.
What are the 3 routes a tuning fork may be heard when placed on the skull?
1.) the inner ear in the cochlea is vibrated
2.) the ossicular chain itself is directly vibrated
3.) the air in the external auditory canal is vibrated but some of this escapes from the ear canal particularly for lower frequencies due to their long wavelengths
What is the purpose of the Rinne test?
determines if a conductive loss is present
What is the procedure of the Rinne test?
Fork is set into vibration and held close to the pinna
What is the response of the Rinne test?
Patient listens to the tone at the ear canal opening and reports when the tone can no longer be heard; then hilt of the still vibrating fork is quickly placed against the patient's mastoid bone. Again the patient is asked if the tone can be heard
What is a negative Rinne?
If the patient can hear the tone, a conductive loss is indicated
What is a positive Rinne?
If the patient cannot hear the tone, a sensorineural loss or normal hearing is indicated
How does the Rinne test work?
If there is no conductive loss the ear will hear the tone by air conduction. It will slowly fade away, and when placed on the mastoid, no sound will be heard.
If there is a conductive loss, it will take a shorter time
for the tone to fade away by air conduction since there
is attenuation by the loss, and when the fork is moved
to the mastoid, the tone will be heard again due to the Occlusion Effect.
What is the purpose of the Weber Test?
Differentiates between a conductive and
a sensorineural hearing loss. Only used in cases of
unilateral hearing loss. It is a test of sound localization.
That is, to which ear does the sound localize when the
hilt of the fork is place in the middle of the forehead
What is the procedure of the Weber Test?
The fork is struck and placed on the midline of the forehead.
What is the response of the Weber test?
The patient is asked to say in which ear the tone is heard.
How does the Weber test work?
When the tone is heard in the poorer ear, a conductive impairment exists; when the tone is heard in the better ear, normal hearing or a sensorineural hearing loss exists.
If it is heard equally in both ears, then the Individual has normal hearing or a SNHL. The tone lateralizes to the poorer ear if it has a conductive loss, because of the Occlusion Effect
What is normal hearing in ADULTS?
Pure tone thresholds of 20dB or less, with air and bone conduction thresholds within 10dB of each other
What is normal hearing in CHILDREN?
Pure tone thresholds of 15dB or less (low fence), with air and bone conduction thresholds within 10dB of each other
What is Conductive Hearing Loss?
Thresholds by air conduction are greater than 20dB, with
bone conduction thresholds within normal hearing levels
What is Sensorineural Hearing Loss?
Thresholds by air and bone conduction are greater than
20dB, and are within 10dB of each other
What is Mixed Hearing Loss?
Thresholds by air and bone conduction are greater than 20dB, with bone conduction thresholds more than 10dB better than air conduction
What is CONGENITAL hearing loss?
Present at birth
What is ACQUIRED/ADVENTITIOUS hearing loss?
Occurs after birth
Know hearing loss time course...
Acute: sudden onset, short duration
Chronic: of long duration
Sudden: having a rapid onset
Gradual: occurring in small degrees
Temporary: of limited duration
Progressive: advancing in degree
Fluctuating: aperiodic change in degree
What are desktop and portable audiometers called and why?
They are called discrete frequency audiometers since they can test individual frequencies from 125hz-8000hz; some may be able to go up to 12000hz
Attenustors are used for regualting _________ and __________?
pure tone and speech loudness
Desktop attenuators range from ______ to ______
-10dB to 120dB
Portable attenuators range from ______ to ______
-10dB to 100dB
Attenuator steps are in ____ increments
What are Transducers?
Sound Field Speakers
When are Transducers used?
Typically used in pediatric behavioral testing, or testing with hearing aids
What is an Audiogram?
A graphing method used to measure individual's hearing thresholds. Thresholds are the softest sounds that the individual can hear.
What is an Octave?
A doubling in frequency
What does the equal loudness curve mean?
different frequencies require different amounts of
loudness, or dB SPL, for the human ear to detect
What are the four components to describing an
1.) Degree or amount of hearing loss
2.) Ears involved in the loss
3.) Type of hearing loss
4.) Shape of audiometric configuration
What are the DEGREES/DESCRIPTORS OF ADULT HEARING LOSS?
*Children - normal (0-15dB)
What are the Terms/descriptors used to describe audiometric shapes?
Unilateral: loss only observed in one ear
Bilateral: hearing loss observed in both ears
Asymmetric: loss is different between ears; or one ear has normal thresholds and the other a loss
Relatively Flat: thresholds for one ear are within 20dB of each other across the audiogram
Sloping: thresholds with a > 20dB difference between octave frequencies, same ear
Precipitous: steeply sloping configuration, i.e. > 40dB threshold difference between octave frequencies in the same ear
Rising: thresholds improving from low to high frequencies in the same ear
Notched: thresholds worse in a given region in one or both ears
Corner: thresholds only present in the lower frequencies in one or both ears
Cookie Bite: Mid-frequencies thresholds poorer than high- or low-frequency thresholds
Reverse Cookie Bite: Mid-frequencies thresholds better than high- or low-frequency thresholds
What is Auditory Threshold?
The intensity of an acoustic
stimulus required to just barely elicit a sensation of
Another aspect of threshold is that it cannot be
sustained. That is, threshold is influenced by the
body's physiology, as well as one's emotion
What is an Audiometric Threshold?
The lowest level at which the presence of a test tone can be detected during two out of three stimulus presentation trials
What are some threshold variables?
Responses based on costs and rewards associated with a hearing loss
Emotional responses can lead to false positives
A goal of monetary gain can lead to false negatives
What is the ascending method for threshold determination?
will present the first tone below what we believe to be their threshold for a given tone, and raise the tone in 5dB steps until they respond. Then down 10dB, and up 5dB as before.
YOU MIGHT ALSO LIKE...
SLHS 654 - EXAM #1
Ear - simple hearing tests
Audiometric testing: manual pure tone audiology
OTHER SETS BY THIS CREATOR
Voice Quiz 2
Voice Quiz 1